US 2011/0254264 A1Published application

High pressure fluid swivel comprising a multi seal pressure regulation system

AssigneeSingle Buoy Moorings Inc.

InventorJack Pollack

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Abstract

A high pressure swivel includes an annular inner wall and an annular outer wall, rotatable relative to one another around an axis, the walls defining a toroidal chamber, an axial gap extending between the walls from the chamber to an outer part, the gap including seen in the direction of the outer part: an isolation seal situated in the gap adjacent the chamber, an isolation gap section extending downstream from the isolation seal, a primary seal situated in the gap, a primary gap section situated downstream from the primary seal, and a secondary seal situated downstream from the primary seal, a first pressure control unit being connected to the chamber, to pressurization elements that are coupled to the isolation gap section for supplying fluid to the isolation gap section from the pressurisation elements when the pressure in the chamber rises and for venting fluid from the isolation gap section when the pressure in the chamber drops, to maintain the pressure in the isolation gap section at a substantially constant value above the chamber pressure.

Claims11

Dependent claims

High pressure swivel (1) comprising an annular inner (3) wall and an annular outer wall (4), rotatable relative to one another around an axis (6), the walls defining a toroidal chamber (7), an axial gap (11) extending between the walls from the chamber to an outer part (12, 12′), the gap comprising seen in the direction of the outer part:

an isolation seal (13) situated in the gap adjacent the chamber,
an isolation gap section (13′) extending downstream from the isolation seal,
a primary seal (14) situated in the gap,
a primary gap section situated (14′) downstream from the primary seal (14), and
a secondary seal (15) situated downstream from the primary seal (14),
a first pressure control unit (21) being connected to the chamber (7), to pressurisation means (24) that are coupled to the isolation gap section (13′) for supplying fluid to the isolation gap section from the pressurisation means when the pressure in the chamber (7) rises and for venting fluid from the isolation gap section when the pressure in the chamber drops, to maintain the pressure in the isolation gap section (13′) at a substantially constant value above the chamber pressure.

3 more elements

Dependencies are inferred from the claim text.